I have been trying to fix this myself, but I cannot find the solution. I am using PyCharm 3.4 on OSX 10.9 with a simple Django project without any keymap customizations. I use the Mac OSX 10.5+ keymap as default per install.
Whenever I press "CMD + SHIFT + 7" ( => 'CMD + /') I dont get the default comment/uncomment functionality. Instead, the "Help"-Menu from the top menubar opens with the "Search" Field in focus.
When I manually go to "Code -> Comment with line comment", the desired functionality works, but it is too annoying to do this everytime.
I checked under Settings->Keymap and the shortcut is defined as described above. As I am clueless what to do, can anybody help me to get this fixed?